No, not hard, impossible.
As I recall, there are four, in addition to those in the PTO shaft. There are also one or two where the chute swivels, which aren't important.
Of the four "real" ones, the one on the rear of the flywheel shift is easy, but the other end of that shift requires taking off the belt guards, which is a pain.
The other two are on the jack shaft that is turned by the PTO. As I recall the front one of those is easy, but the rear one has to be accessed through a hole in the rear plate that isn't big enough to get any grease gun I've found on it. I tried enlarging the hole but didn't have tools to make that work.
I finally after many years of fussing with the two difficult ones I fixed both with extenders. The one on the front of the flywheel shift I extended up through the belt guard by cutting a hole in it and using some brass nipples and fittings from the auto parts store.
The one on the rear of the jack shaft I extended with a hose from GreaseExtensionHoses.com. I found their standard 8-inch hose would reach out though a hole I drilled in the side of the frame that put the zerk there. It required a 6mm thread adapter to connect the hose to the bearing. (I used a second adapter from them to connect the auto supply fittings to the other bearing).
Getting the hose started in the hole on the bearing with the pully in the way was fun, but I figured out a way to do it. As I recall it involved masking tape and a piece of wood to keep the hose straight until the threads started.
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